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    主要教学视频
    课程大纲（音频预览）
    补充材料下载
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            <section><video src="./static/mp4/test01.mp4" controls></video>（主要教学视频）</section>
            <section><audio src="./static/mp3/test01.mp3" controls></audio>（课程大纲）</section>
            <section><a href="#">（补充材料下载）</a></section>
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